"Red" matching MCP servers:

A tree whose vocabulary, rules and solvers are data, edited at runtime through generic tree_* tools. Rules go red on the node that breaks them, so it works as a design-dexision ledger on any checked knowledge base.

An MCP server for AI assistants to programmatically create and manage Entity-Relationship Diagrams in StarUML, including full CRUD operations and PostgreSQL DDL generation.